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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35a875dd13ab0cdacca50cbe9146cdb50230408a9a86000b1732074a2dfb923' 
  AND token = '8VYWGRfsj13egIf6/71f/GYjMwhSY8pwc4PW1Gm/2Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}